US7349302B2 - Optical disk recording apparatus and optical disk recording method - Google Patents

Optical disk recording apparatus and optical disk recording method Download PDF

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Publication number
US7349302B2
US7349302B2 US10/641,904 US64190403A US7349302B2 US 7349302 B2 US7349302 B2 US 7349302B2 US 64190403 A US64190403 A US 64190403A US 7349302 B2 US7349302 B2 US 7349302B2
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Prior art keywords
sync
phase
sync pattern
synchronization
producing
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US10/641,904
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US20040179446A1 (en
Inventor
Yutaka Nagai
Takehiko Sekine
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Hitachi LG Data Storage Inc
Hitachi Consumer Electronics Co Ltd
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Hitachi Ltd
Hitachi LG Data Storage Inc
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Assigned to HITACHI CONSUMER ELECTRONICS CO., LTD. reassignment HITACHI CONSUMER ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI, LTD.
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10212—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter compensation for data shift, e.g. pulse-crowding effects
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1267—Address data
    • G11B2020/1274—Address data stored in pre-pits, i.e. in embossed pits, ROM marks or prepits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
    • G11B2020/1287—Synchronisation pattern, e.g. VCO fields
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/216—Rewritable discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/218—Write-once discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs

Definitions

  • the present invention relates to a recording apparatus for recording on a DVD-R or a DVD-RW, for example, and in particular, it relates to a recording apparatus, while reproducing land pre pit information, which is recorded on a land track in advance, for indicating address information on the disk, for recording on the disk in accordance therewith.
  • reproduction of the land pre pits is performed in the following manner, in particular, on those that are formed on the DVD-R and/or DVD-RW.
  • a light beam is irradiated upon the groove track, on which information is recorded, thereby obtaining a wobble signal from a reflection light thereof, through so-called a push-pull method.
  • This wobble signal is then compared to a predetermined threshold signal, so as to extract a signal therefrom, exceeding the threshold signal, thereby obtaining the land pre pit signals, which are superimposed on the wobble signal.
  • the land pre pit signal has a rule of appearing for every eight (8) wobble cycles, as was mentioned in the above, however in more detail, the land pre pit signal appears in the front-side three (3) cycles of a first half of eight (8) wobble cycles, or the front-side three (3) cycles of a second half of eight (8) wobble cycles, among the continuous 16 wobble cycles.
  • the front-side 3 cycles of the first 8 cycles are called by “even”, while the front-side 3 cycles of the second 8 cycles are called by “odd”.
  • 16 ⁇ 13 wobble cycles are called by a “sector”, and a land pre pit information of a sector synchronization signal appears in either the even or the odd side of the top 16 wobble cycles of the sector.
  • FIG. 7 shows a chart for showing the meanings of pre pit patterns of the front-side 3 cycles and the respective pre pit patterns thereof, among the wobbles of 8 cycles.
  • “111” means an even sync pattern recorded at the “even” position
  • “110” an odd sync pattern recorded at the “odd” position
  • the land pre pit information is “111”, when it has the sync signal in the even side, while it is “110” when it has the sync signal in the “odd” side.
  • the recording apparatus erroneously recognizes to be “odd” in the position thereof, in spite of the “even” position on the disk.
  • An object according to the present invention is to protect the recording apparatus from such the shifting in the position for starting the recording.
  • the object mentioned above, according to the present invention can be accomplished by provision of a detection cycle counter for counting 16 ⁇ 13 wobble cycles, wherein the detection cycle counter is synchronized when a sync signal of land pre pit information is detected, and at the same time a sync lock flag is set.
  • a sync lock flag keeps the condition of being set if the sync pattern indicative of the even is detected after 16 ⁇ 13n (n: a natural number) wobble cycles, or if the sync pattern indicative of the odd is detected after 16 ⁇ 13n+1 wobble cycles, next, and also in a case where the sync pattern of the even or odd is detected at a timing different from the mentioned above, synchronizing is made on the detection cycle counter, as well as, resetting the sync lock flag at the same time. Also, in a case where it cannot be detected for a time period being equal or longer than 16 ⁇ 13m+1 (m: a natural number) wobble cycles, the sync lock flag is reset. And, when the sync lock flag continues the condition of being set for a predetermined time period, a recording timing producing cycle counter, which is provided separately, is synchronized by means of the detection cycle counter.
  • an optical disk recording apparatus for recording a digital signal on a recordable optical disk, wherein a first sync pattern recorded in a phase 1 and a second sync pattern recorded in a phase 2 are recorded at positions, having a predetermined relationship in the phases the thereof, on a track wobbled at a constant cycle, comprising: a detection window producing means for said phase 1 ; a detection window producing means for said phase 2 ; a sync lock flag producing means for producing a sync lock flag indicative of a condition that synchronization is locked; and a recording timing producing means for producing a recording timing onto said optical disc, wherein said sync lock flag producing means produces the sync lock flag indicative of the condition that the synchronization is locked, when the first sync pattern is detected in the phase 1 or when the second sync pattern is detected in the phase 2 , while producing a sync lock flag indicative of a condition that the synchronization is unlocked when the first sync pattern is detected
  • FIG. 1 shows an optical disk recording apparatus, according to one embodiment of the present invention
  • FIG. 2 shows a time chart for an example of land pre pit signals, which will be treated within the present invention
  • FIG. 3 also shows a time chart for an example of the land pre pit signals, which will be treated within the present invention
  • FIG. 4 shows a time chart for an example of the land pre pit signals, which will be treated within the present invention
  • FIG. 5 shows a time chart for an example of the land pre pit signals, which will be treated within the present invention
  • FIG. 6 shows a data format of the land pre pit signal upon basis of the DVD-R standard
  • FIG. 7 also shows a data format of the land pre pit signal upon basis of the DVD-R standard
  • FIG. 8 shows a time chart of a sync detection cycle counter, according to the embodiment.
  • FIG. 9 also shows a time chart of a sync detection cycle counter, according to the embodiment.
  • FIG. 10 shows a time chart of a recording cycle counter, according to the embodiment.
  • FIG. 11 shows an optical disk recording apparatus, according to other embodiment of the present invention.
  • FIG. 12 shows an optical disk recording apparatus, according to further other embodiment of the present invention.
  • FIG. 13 also shows an optical disk recording apparatus, according to further other embodiment of the present invention.
  • FIG. 1 is a block diagram of a disk recording apparatus according to the present invention.
  • a reference numeral 101 is a means for detecting a pre pit formed on a land track of a disk, 102 a means for detecting an even sync pattern from the pre pit detected, and 103 a means for detecting an odd sync pattern from the pre pit detected.
  • the even sync pattern detection means 102 detects the pattern “111”, and the odd sync pattern detection means 103 detects the pattern “110”, respectively.
  • a reference numeral 104 depicts an detection cycle counter, turning one (1) round by 16 ⁇ 13 wobbles, and it is synchronized with a timing, at which the respective patterns should be generated, when the sync signals are detected by the even sync pattern detection means 102 and the odd sync pattern detection means 103 , respectively.
  • a reference numeral 105 depicts a detection window, which is produced by the detection cycle counter 104 and is opened at a position where the odd sync pattern should be generated.
  • a reference numeral 106 depicts another detection window, which is produced by the detection cycle counter 104 and is opened at a position where the even sync pattern should be generated.
  • a reference numeral 107 depicts an even/odd un-detect signal generation means, and it generates an even/odd un-detect signal when the detection cycle counter 104 counts up for a predetermined period, but not being synchronized with upon detection of the even/odd sync pattern.
  • a un-detect number counter 108 counts the number of times when the even/odd un-detect signals are generated, continuously, but without detecting the even/odd sync pattern.
  • a reference numeral 109 is a sync un-detect number count setting value, and it produces a sync lock flag reset signal when the even/odd sync pattern un-detect continues and reaches to the number of times, which is set in advance.
  • a sync lock flag 110 is reset by any one of the sync lock flag reset signal from 109 , the even sync pattern detection signal from 105 , which is gated through the odd window, and the odd sync pattern detection signal from 106 , which is gated through the even window.
  • a gate circuit 116 is opened in a case where the sync lock flag 110 is reset into the unlock condition.
  • the sync lock flag 110 is set into the lock condition, by either one of the even sync pattern detection signal, which is detected by the even sync pattern detection means, or the odd sync pattern detection signal, which is detected by the odd sync pattern detection means.
  • the sync lock flag 110 turns into the unlock condition, in any cases where the sync pattern cannot be detected, continuously, for a predetermined time period, when the odd sync pattern is detected at the position where the even sync pattern should be generated, and when the even sync pattern is detected at the position where the odd sync pattern should be generated, and also it turns into the lock condition when the sync pattern is detected under the unlock condition.
  • a recording cycle counter 112 for producing a recording timing is synchronized with the detection cycle counter.
  • An encoder 113 conducts the encode processing in accordance with the DVD format, at the timing produced by the recording cycle counter. After being waveform shaped in a laser diode driver 114 , the encoded signal drives a laser diode 115 .
  • the synchronization can be carried out on the recording timing, with stability.
  • FIGS. 2 , 3 , 4 and 5 All of those FIGS. 2 , 3 , 4 and 5 are in accordance with the standard of the land pre pit of the DVD-R/RW shown in FIGS. 6 and 7 .
  • the “even sync pattern” lies at the position of “even”, i.e., at the head of 201 , and at the position of “even” following thereto lies “0 (binary)” data.
  • the data “0000000000 (binary)” lies at the position of “even”.
  • “1 (binary)” lies at the first “even” position, and at the “even” position following thereto lies “even sync pattern”.
  • “000100 (binary)” lies at the “even” position.
  • FIG. 2 is shown a case where all the land pre pits lie at the positions of “even”, however according to the DVD standard, it is determined to use the “odd” position, so that the land pre pits are not adjacent to each other on the neighboring tracks.
  • FIG. 4 an example is shown in FIG. 4 , where the sync pattern is erroneously recognized, due to such as a result of filtering process, etc.
  • the last pulse is lost on the even sync pattern “111” at the position 407 where the even sync patter is recorded, thereby changing into the odd sync pattern, i.e., “110”. Accordingly, if recognizing the position where the odd sync pattern is detected to be the position of the “odd”, there occurs shifting in the position recognition.
  • the detection cycle counter is synchronized with the even sync pattern of 401 , and then the windows are produced at the position where the even sync patter should be generated and the position where the odd sync pattern should be generated.
  • the even sync pattern is in the unlock condition. For this reason, the recording cycle counter is inhibited from being synchronized with the detection cycle counter, and therefore the recording is protected from causing the position shifting therein.
  • FIG. 5 an example is shown in FIG. 5 , where a pseudo sync pattern is produced, due to mixture of noises, etc.
  • “1” rises up at the last bit of the odd sync pattern “110”, i.e., at the position 507 where the odd sync patter is recorded, due to noises, then it is erroneously recognized to be the even sync pattern “111”. Accordingly, if recognizing the position where the even sync pattern is detected to be the position of the “even”, there occurs shifting in the position recognition.
  • the sync lock flag is in the unlock condition. For this reason, the recording cycle counter is inhibited from being synchronized with the detection cycle counter, and therefore the recording can be protected from being shifted in the position thereof.
  • the horizontal axis in FIG. 8 indicates a reproduction position while the vertical axis a value of the counter.
  • FIG. 9 also shows the operation of the detection counter, in a similar manner.
  • FIG. 10 shows the detection condition for each of the sync signal of “even” or “odd” at a unit of sector, and behavior of the sync lock flag for it, as well as, the synchronization operation of the recording cycle counter.
  • “x” indicates the condition where the odd sync pattern is detected within the even sync pattern detection window, or the condition where the even sync pattern is detected within the odd sync pattern detection window.
  • a mark “ ⁇ ” indicates a case where no new sync pattern cannot be detected after passing 208 or 215 wobble cycles.
  • a mark “O” indicates the condition where the even sync pattern is detected within the even sync pattern detection window, or the condition where the odd sync pattern is detected within the odd sync pattern detection window.
  • the “sector No.” indicates the relative address, which was shown in FIG. 6 , from bit 1 to bit 4 .
  • the sector 15 at the end of the left-hand side is in the “x” condition, and the sync lock flag is in the unlock condition. It comes into the “O” condition at the sector 1 , and then the sync lock flag turns back into the lock condition.
  • the detection condition continues to be “O” from the sector 0 to the sector 15 , and the sync lock flag continues to be the lock condition.
  • the sync lock flag check region producing means 111 shown in FIG. 1 is determined by the sync lock flag check region producing means 111 shown in FIG. 1 .
  • it is in the “x” condition at the sector of the left-hand side end, and then the sync lock flag is in the unlock condition.
  • it is in the “O” condition at the sector 1 , and then the sync lock flag turns back to the lock condition.
  • the “ ⁇ ” condition continues eight (8) times from the sector 4 , and at the sector 11 , the sync lock flag turns into the unlock condition.
  • the synchronization may be conducted by any number of times, if the lock condition continues for the time period between the sector 0 to the sector 15 , in the present example, but it is also possible that the synchronization is conducted only one (1) time, i.e., at the first time among those when the conditions are satisfied, during the time period, starting from beginning read-out of the land pre pits after moving a pick until the recording. Limiting the number of times of synchronization to only one (1) time enables to reduce the possibility of shifting due to the erroneous sync patter, much more.
  • FIG. 11 is a block diagram of the disc recording apparatus according to the present invention.
  • the structures are same to those shown in FIG. 1 , but except for 1101 and 1102 .
  • the reference numeral 1101 indicates an odd sync pattern counter, and it counts up the number of the odd sync patterns within the region, which is determined by the sync lock flag check region production means 111 , so as to resets the sync lock flag 1102 when it exceeds a predetermined number, thereby bringing it into the unlock condition.
  • Other operations thereof are same to those of the disc recording apparatus shown in FIG. 1 .
  • the present embodiment utilizes the fact that, inherently, the odd sync pattern is used for the purpose of shifting the position thereof if the even sync patterns are adjacent with each other on the neighboring tracks, and therefore it will never exceeds a certain ratio. According to the present embodiment, it is possible to enhance the protection from generating the position shifting when recording.
  • FIG. 12 is a block diagram of the disc recording apparatus according to the present invention.
  • the structures are same to those shown in FIG. 11 , but except for 1201 , 1202 and 1203 .
  • the reference numeral 1201 indicates a sync detection window; thus, a window to be opened at the position where the even sync pattern or the odd sync pattern should be generated.
  • the detection cycle counter 1202 may be synchronized with, also via the sync pattern not passing through the sync detection window 1201 , in the case where the sync lock flag 1102 is in the unlock condition, however in the case where the sync lock flag is in the lock condition, the synchronization is carried out on the detection cycle counter 1202 only when the sync pattern detection is conducted within the sync detection window 1201 . However, this sync detection window 1201 is produced by means of detection cycle counter 1202 .
  • an un-detect number counter 1203 may be reset by the sync pattern that does not passing through the sync detection window 1201 , in the case where the sync lock flag 1102 is in the unlock condition, however in the case where the sync lock flag is in the lock condition, it is reset only in the case where the sync pattern detection is conducted within the sync detection window 1201 .
  • Other operations are similar to those of the disc recording apparatus shown in FIG. 11 .
  • the detection cycle counter 1202 since the detection cycle counter 1202 does not conduct the synchronization on the pseudo sync pattern during when conducting the sync lock, even in the case where the pseudo sync patterns are generated due to noises at the land pre pits indicating the data bits, therefore no such the position shift occurs in the recording cycle counter, thereby achieving the recording at the correct position.
  • FIG. 13 is a block diagram of the disc recording apparatus according to the present invention.
  • the reference numeral 1301 indicates a reverse signal of the sync detection window 1201 , and it opens the window at the position where, inherently, the sync signal should be detected.
  • the reverse window 1301 is produced by means of a detection cycle counter 1302 . With the sync pattern, passing through the reverse window 1301 to be detected, a sync lock flag 1303 is reset, and it is in the unlock condition. Accordingly, the recording cycle counter is not synchronized with, even if detecting the sync pattern passing through the reverse window, therefore the synchronization will not occur, erroneously.
  • the present invention it is possible to protect the recording position from being shifted in the position thereof, if the even sync pattern is erroneously detected to be the odd sync pattern, or if the odd sync pattern is erroneously detected to be the even sync pattern.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
US10/641,904 2003-03-11 2003-08-15 Optical disk recording apparatus and optical disk recording method Expired - Fee Related US7349302B2 (en)

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JP2003-064326 2003-03-11
JP2003064326A JP4032003B2 (ja) 2003-03-11 2003-03-11 光ディスク記録装置、および、光ディスク記録方法

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JP2006164490A (ja) * 2004-11-10 2006-06-22 Victor Co Of Japan Ltd 同期信号検出装置、同期信号検出方法、及び同期信号検出プログラム
JP2007149255A (ja) * 2005-11-29 2007-06-14 Toshiba Corp 同期判定装置、物理アドレス検出装置及び方法

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JPH10340536A (ja) 1997-06-06 1998-12-22 Pioneer Electron Corp プリピット情報検出装置及び検出方法
US6333902B1 (en) * 1998-04-17 2001-12-25 Samsung Electronics., Ltd. Method for generating land/groove switching signal from POLG type disc and apparatus therefor
JP2000195177A (ja) 1998-12-28 2000-07-14 Pioneer Electronic Corp 記録タイミング設定装置及び情報記録装置並びに記録タイミング設定システム及び情報記録システム
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